The methods of reproduction in fishes are varied, but most fishes lay a large number of small eggs, fertilized and scattered outside of the body. The eggs of pelagic fishes usually remain suspended in the open water. Many shore and freshwater fishes lay eggs on the bottom or among plants. Some have adhesive eggs.
Where do eggs come out of fish?
The genital papilla is a small, fleshy tube behind the anus in some fishes, from which the sperm or eggs are released; the sex of a fish can often be determined by the shape of its papilla.
Do fish lay live eggs?
The majority of common tropical fish live for an average of three to five years, while goldfish are among those living the longest, potentially up to 20 years. Koi, who are cousins of the goldfish, can live up to 40 years.
Which fish does not lay eggs?
Livebearing fish are some of the most popular tropical aquarium fish of all time and include guppies, platies, mollies and swordtails. They are so-called because the females give birth to live young, instead of laying eggs like other freshwater fish species.
Do all the fish lay eggs? – Related Questions
Do any fish have live births?
Live birth is also rare in fish, accounting for about two percent of known species, including guppies and sharks.
How did fish give birth?
Fish reproduce by bearing live young or by laying eggs. Livebearers give birth to fully formed and functional young called fry. The eggs are fertilized and hatch within the female.
What dont lay eggs?
With only two exceptions, the echidna and the platypus, all mammals deliver live births. Reptiles, on the other hand, generally lay eggs to hatch their young. Like the two rare mammals that lay eggs, this trend is broken for reptiles by a few species that give live birth to their young.
What sea animal doesnt lay eggs?
Whale sharks (Rhincodon typus) are the largest species of shark. Although these animals produce eggs, they don’t lay them. Instead, the young hatch while still in the female’s body and are born as miniature adults. This is known as ovoviviparity.
Do not all fish lay eggs?
Not all fish produce eggs
A few species of fish do not lay eggs but produce live babies, called fry. Some live bearers breed easily in home aquariums, including guppies, swordtail, Endlers fish, mollies, and platies.
Do guppies lay eggs?
Guppies do not lay eggs. They’re livebearing fish which means the eggs remain in their body until the fry are old enough. Once they’re old enough, the female gives birth to her fry.
Can guppies get pregnant without a male?
A unique feature among female guppies is their remarkable ability to give birth to several broods consecutively without male insemination occurring each time. This is possible because of special folds in the female’s genital area that store sperm until it is later needed for fertilization.
Do guppies hold sperm?
Like other poeciliids, guppies are livebearers with internal fertilization. Males provide no resources during mating, nor do they defend territories against rival males. Furthermore, females can store sperm for several months and produce a succession of litters from a single insemination (2).
How do fish give birth in a tank?
Some aquarium fish carry the eggs inside of them. When the eggs are fertilized, they eventually hatch inside the mother, and the babies emerge in a live birth. Other types of fish lay hundreds of eggs in nests within the aquarium, in this case, the males fertilize these eggs, and then they hatch into live fish.
How long do fish stay pregnant?
Live Bearing Fish Gestation Period
However, the gestation period could vary from one species to another. Even so, the most common time period is about 4 weeks. This is the time that has to pass from the moment of egg fertilization, to the moment when the birth is taking place.
Can male fish give birth?
In all of the vast animal kingdom spanning the planet, seahorses (and their pipefish and sea dragon relatives) are the only species whose male members give birth to young. This underwater photograph shows a male Korean seahorse (Hippocampus haema) releasing juveniles into the water off the coast of Japan.
How do u know if a fish is pregnant?
As your female fish becomes pregnant, she will grow a bulge at the back of her abdomen. This typically appears over the course of 20-40 days. Does your fish have a red or black spot? Sometimes, when a female fish is pregnant, she will develop a “gravid spot” on the abdomen.
How do you tell if my fish is a boy or girl?
You can determine the sex of your fish by inspecting its gonads (reproductive organs), which are located towards the top of the gut cavity. Mature female fish will have orange ovaries and male fish will have white testes (see photos above).
Do pregnant fish lay on bottom of tank?
One explanation for seeing a female guppy fish hanging out at the bottom of the aquarium is that she’s pregnant and in labor. If you’re keeping both female and male guppies, chances are very high that they’ll reproduce and that the female will give birth to fry.
What does a fish look like when it’s giving birth?
To accommodate the developing eggs, the mother’s body expands, becoming deeper and broader. A few days before delivery, she develops a bulge below the gills, her outline becoming fairly square in this region, while the gravid spot has enlarged its area.
Do fish feel pain when they give birth?
Summary: Fish do not feel pain the way humans do, according to a team of neurobiologists, behavioral ecologists and fishery scientists. The researchers conclude that fish do not have the neuro-physiological capacity for a conscious awareness of pain. Fish do not feel pain the way humans do.